Grinding-machine for rotary cutters



H. M. LOOMER.

GRINDING MACHINE FOR ROTARY CUTTERS.

APPLICATION FILED OCT 20,1919- 1,386,638, Patented Aug. 9, 1921.

M er s ng,

HENRY rt. LooMnit, or nnvnnnr; iaAssnoi-insnrrs, ns'siono'n 'IO UNITED SHO MACHINERY CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION or NEW JERSEY.

mes es.

Specification of Letters Patent.

Patented Aug. a, rear.

Application filed October 20, 1919. semi No. 331,887.

To all whom it may concern:

Be it known that I, HENRY M. LOOMER, a citizen of the United States, residing at Beverly, in the county of Essex and State of h l'assachusetts, have invented certain Improvements in Grinding-Machines for'Rotary Cutters, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicatmg like parts in the several figures. I

This invention relates to mechanism for grinding rotary cutters such, for example, as are used for trimming the edges Of the foreparts of boot and shoe soles.

Various mechanisms have been devised for grinding cutters of the type shown in the patent to Loom'er 1,105,672 wherein the front face of eachto'oth is located at a predetermined angle with respect to the axis of the cutter. The diameters of cutters vary and the axial lengths thereof also vary according to the character of the work to be erformed by the cutters. Different shapes and sizes of cutters vary considerably in the angle between the plane of the cutting face and the plane of the end face of the cutters. I

In a former application filed by the April and illustrated a grinding mechanism cap able of accurately locating the cutter w1th respectto the grinding member and controlling the position of the cutter to effect proper grinding of the teeth, the mechanism of that device including a longitudinally 'ez'rtensible arm which is pivotally mounted on a" support and carries the cutter in such direction relatively to" the grinding wheel that sald cutter moves in the are of a circle parallel with the plane of the grinding wheel, the arm being manipulated by the operator so that the cutter sweeps past the grinding wheel in said are. p

An important object of the present invention is to provide an iniproved grinding device of the character described which will be so organized as to iri'su re that the proper angle of the work relatively to the' grinding wheel will be maintained regardless of changes which may be effected the length of the arm carrying the cutter.

In factories which use grinding machines o f this general character, it is customary to i injuring the attachment or disarranging the relative adjustment of the parts thereof. To avoid risk of this, it is, desirable to remove the attachment when not in use. To enable the attachrne'ntto beeas'ily removed as a whole and replaced as a whole without disturbing therel'atively adjusted position of the parts thereof, and with practical cer: tainty that the cutter support or table will occupy the same position when returned afterre'rnoval that it occupied before removal, is another object of the present invention.

Accordingly, a further feature of the invention consists in a grinding machine having a removable work-supporting attachment, and means for adj ustably determining the position of the attachment relatively to 17, 1917, Serial No. 162,7 58 I have d'GSCIlbQd the grinding member of the machine to enable the attachment, after removal, tobe replaced so as to present the work to the grinder in a relationship determined by its setting prior to removal. Preferably, and

in accordance with a further'feature of the lated from a position out of contact with the grinding wheel into contact therewith and beyond to a variable point whichmay be predetermined by adjustment.

The invention will be more readily understcod from the following specification taken in connection with the accompanying drawings in which,

Figure 1 is a perspective view of a grinding' member and my improved cutter supporting device in one of its embodiments;

Fig. 2 represents a section on line 2 2 of Fig. 1 looking toward the grinding member; Fig. 3 is a plan view of the parts shown at the left of Fig. 1; 1 j Fig. 4 is'a'perspective view, partly broken out, illustrating another embodiment of the,

invention; v

Flg. 5 represents a section on line 5-5 of Fi 4;; and

Fig. 6 is a plan view of a portion of the device shown in Fig. 4:.

Aportion of the. frame of the machine is indicated at12, the same having bearings 13 for a, shaftl icarryingthe disk-shaped grinding member 15, the shaft being driven by any suitable means such as a belt applied to the pulley 16. V V 1 'A bracket 17 for carrying the support to which the cutter .carryingarm is resiliently pivoted as hereinafter described is provided provided with slots forming'rack teeth 27- with a slot 18 at its inner end. A wing nut 19' applied to a screw 20 rising-from a ledge 210i the frame, enables the bracket 17, after' {it has been adjusted as hereinafterdescribed,

to be clamped in operative relationship to the frame and grinding member.

.The outer end of thebracket 1? has atransverseslot 22 through which a screw23 passes into the-base or slide 24 ofthe support to which the cutter carrying arm 13 pivotally connected. A groove 25in the under side of the base'2 1 fits a rib 26.0f the bracket 17. The said bracket is formed or engaged by'a pinion '28 carried by a shaft 29 having a handle 30 and mounted in the slidable base24. :By loosening the screw 23 and then rotating the shaft 29, the base or slide 24; can be adjusted in a direction substantiallyparallel with the axis of rotation of the grinding wheel. the rib and groove 26,

25, guiding the slide in such movement. After iIl16- 21Cl]11StI11QZ3l31S effected a tlghtening pof-the screw 23 which carries a suitable washer as indicated bydotted linesin Fig. 1 securely position. a v 1 I The slide 24 has cars 31 in which ismounted a pin 32, saidpin also passing into or throughears 33,0fabar 34L, the'pin 32 therefore providing a pivot for the bar 34 and the arm 35' which projects therefrom, preferably integral therewith. A spring 36 carriedaround the pin 32 acts, as hereinafter described, to normally hold. the arm 35 swung upwardly. V

The arm 35 has a longitudinal groove 37 preferably somewhat V-shaped asshown in Fig. 2, the outer end of the arm being .en-

larged as at 38. The shank 39 of the cutter supportor table 4O having'a pin. 41, is mountedfin the groove 37 of arm 35' and se-' cured therein by an. eye bolt 4L2 haviirlg a holds the slide 24: in its adjusted threaded end 43 which is engaged by a wing nut 44:. This eyebolt is employed to clamp the shank 39 01 the cutter support 40 after ,the same has been adjusted longitudinally .of the arm35 and rotativelytherein.

Whenjt'is desired tofvary thefangular adj ustment of the pi'n' ll on the cutter (l is mounted, onto alter the longitudinal position of the shank 39relatively to the arm 35, thewing nut 44 is loosened, the adjust- "ment effected, and the wing nut 4Ais again setup. In order that the angular adjustment of the table 10 and its pin 11 may be determined, and: maintained during any relative movements while the nut 14 is loosenedyl provide means for" preventing any, disturbance of" that 'zangular ;,adjustmenti Said means, in the embodimentofthe invention i'l-lustrate'din Figs. 1 and 2,} comprises a end will bear upon the surface of the arm 35v just described. Afterward,- ifthere is any occasion for-loosening theieye bolt, either to I enable the shank 39 tobe shifted along the arm 35 or for any other,purpose, it ison'ly necessary for the operator to hold theparts with the lower 'end of-the screw l6 bearing on-the 'arm135untilgthe eye bolt isagain,

clamped. :l i .1 v a The slide 245 is'provided with afrigid arm 48 through which a screw d9 passes, a binding nut 50 being employed to hold the screw 49 in' adjiisted positionto serve as a stop to limit downwardgmovement of the arm 35-.

In the. embodiment of the invention illustrated in Figs-,4, 5 and 6 the parts having the :same reference characters as? employed in Fig. :1 are the same or substantiallythe I same as those parts.

As. shown in Figs. 4"and' '5 theshank of the cutter rest 40,instead of'be'ing circular in cross section is-ovoid, and so fits the V- -shaped grooveinarm that said shank can not'be rotatedinsaidarm; liotative adjustment in order to 'vary the angular position of 'the cutter rest 10 is effected by providing for rotative adjustment of the arm5l. rela tively to the bar 34 which, of course, is pivotally'supported in the same manner as the" similarlyfnumbered member in Fig. 1. To

with ta isleeve 53 'rotatively mounted" in an opening in; the bar 3 1 and held therein by means ofa-screw-b(Figsd' and 6) passing through a washer 55,. into said sleeve 5 3, A

this end, the base 52*of the arm 51is'formed 1 portion of the edge of base 52 is formed or provided with teeth 56 engaged by a worm screw 57 mounted in lugs 58 of the bar 34. By rotating the worm 57 the arm 51 and consequently the cutter table 'or rest 40 and its pin 41 can be easily adjusted to vary the angular position of the pin 41 relatively to the plane of the operating face of the grinder 15. Owing to the fact that the shank 39 (Fig. 4) can not be rotated relatively to arm 51, the eye bolt 42 can be loosened and clamped again whenever the entire pivoted arm is to be lengthened or shortened without disturbing the angular adjustment of the cutter support 40, 41. As indicated in Fig. 6 I may provide the bar 34 with scale marks 59 to coiipe'rate with an indicating mark 60 carried by the base 52 of the member 51.

Whether the invention is embodied in a device of the specific character indicated in Fig. 1 or Fig. '4, the pivoted member 34, 33 and the longitudinally extensible arm for the cutter carried thereby is limited in its up ward movement under the influence of spring 36 by a lug 61 projecting from one of the ears 31 into the path of a portion of an ear 33 below the pivot 32.

As indicated in Fig. 3 the bar 34 is provided with a lug 62 against oneside of which the end of spring 36 bears. This is to prevent lateral play of the bar 34 and its ears 33 which would interfere with oscillating movement of the cutter carrying arm in an accurate plane. By having the end of the spring 36 deflected to bear against one side of the lug 62, said spring serves the double purpose of not only urging the entire extensible arm upwardly on the pivot 32, but also urges one of the ears 33 against one of the ears 31 as shown at the right in Fig. 3 so as to guide the cutter carrying arm in a [HGClQtGIIIllIlGCl oscillatory plane.

It will now'b'e understood that in the operation of either of the devices illustrated the cutter may be oscillated through an arc intersecting the periphery of the grinding member, with the result that the cutter may be brought into and removed from engagement with the grinding member by a continuous sweeplng movement or the cutter supporting arm, and when any longitudinal adjustment of the arm is desired, the same can be effected without liability of disturbing the proper angular position of the end of the arm which carries the cutter.

As fully explained in my former application No. 162,7 58, each tooth ofthe cutter can be brought into position and subjected to the action of a grinding wheel by simply rotating the cutter on the pin 41 when in a position away from contact with the grinding wheel, and by then simply depressing the extensible arm against the action of spring 36, holding the cutter at the Same time with the face of the tooth to be ground bearing against and passing over the surface of the grinding wheel.

Referring to Fig. 1, the bracket 17 is provided with a threaded hole in front of the slot 18, and a screw 63-passes through said hole to contact with an abutment or lug 64 rising from the frame ledge 21. Preferably, there are two lugs 64, one in front of and the other behind the screw 20, said lugs having a width corresponding with the width of the slot 18. Obviously, the two lugs 64 might be merged into a single rib fitting the slot, 18, with the screw 20 rising from the rib. As indicated in Fig. 1 the frame ledge 21 is wide and formed with duplicate sets of lugs 64 and screws, to enable right andleft hand attachments to be employed. machines of this character have a grinding member at each end of the shaft 14, the illustration showing but one for lack of space. Assuming, however, that such a machine has a second grinder carried by that portion of the shaft which is broken away, then an attachment similar to the one illustrated but having the outer end of the bracket 17 curved to the right instead of to the left, would, when needed, be mounted on the part of the ledge 21 which is'shown as unoccupied.

The screw 63 is employed to render certain the correct replacement of the attachment after removal. Assuming that the attachment has. been correctly set as indicated in Fig. 1 and it is to be temporarily removed, the operator simply turns the screw 63 so that inner end bears against the front face of the lug 64 and then loosens the clamp screw 19 and removes the attachment which may then, at any time so long as the screw 63 has not been disturbed, return the attachment to the exact position. relatively to the grinder which it formerly occupied.

VJhile I have herein shown and described two preferred embodiments of my invention, itis to be understood that I do not desire to be limited to either of the exact arrangements shown. I

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a machinefor grinding rotary cutters, an arm, a cutter support angular-1y and longitudinally adjustable on the arm, means for retaining the cutter support in its position of longitudinal adjustment and means for preventing disturbance of the angular adjustment when altering the longitudinal adjustment.

2. In a machine for grinding rotary cutters, an arm, a cutter support angularly and longitudinally adjustable on the arm, means for retaining the cutter support in its position of longitudinal adjustment, means for determining the degree of angular adjust- Many I i ment, and means for retaining that adjustment when altering thelongitudinal adjust-- 1 ment. V

3. In a machine for grinding rotary cutters, an arm, a cuttersupport angularly and longitudinally adjustable on the arm, means for determining the degree of angular adjustment, and means includinga screw for effecting and retaining that ad ustment when altering the longitudinal adjustment.

4. A machine of the character described,

comprising, a grinding wheel, a .pivoted member mounted for movement on an axis substantially parallel to the axis of the grinding wheel, "a cutter support angularly and longitudinally adjustable on the pivoted member, and means for preventing disturbposition of the cutter support relatively to the grinding wheel when the extensible arm is varied in length; I

6. In a machine for grinding rotary cutters, a grinding wheel, a support,*an arm pivotally mounted upon said support for movement about an axis substantially parallel tolthe axis'of the grinding wheel, a cut ter supporting table adjustably carried by said arm to vary the angle between the plane of said table and the plane of oscillation, and means both for effecting and maintaining a fine angular adjustment of the table.

7. In a machine for grinding rotary cutters, a grinding wheel, a-support, an arm pivotally mounted upon said support for movement about an axis substantially parallel to the axis of the grinding wheel, a cutter supporting table adjustably carried by said arm tovary the angle between the plane of said table and the plane of oscillation, a screw to turn the table angularly on the arm, and means for adjusting said support in a direction substantially parallel with the axis of rotation of the grinding wheel, said adjusting means including a rack and pinion.

8. In a machine for grinding rotary cutters, a grinding wheel, a swinging arm, an

angularly adjustable and longitudinally slidablc cutter-carrying member mounted to rotate and slide upon said swinging arm, and means for preventing disturbance of the angular adjustment when alteringvthe longitudinal adjustment.

9. In a machine for grinding rotary cutters, a grinding wheel, a bracket adjustably mounted relatively to said Wheel, a cutter arm pivotally supported by said bracket, resilient means for actuating said arm in one direction, a stop for opposing the action of saidresilient means, and an adjustable stop for limiting the movement ofrsaid arm in the direction which is opposed by saidresiliing the angular'positionv of the cutter support when the clamp is loosened.

11. In a machine for grinding rotary vcutters, a pivoted yieldingly-supported member, an armrotatably connected therewith,

means for rotatably adjusting said arm, a

shank and arm together. v V V 12. In a. machinefor -grindingrotary cutters, a pivoted yieldingly-supported member, an arm rotatably connected therewith,

said arni'having a toothedportion, a worm screw carried by said member. and engaging its teeth torotativelyad ust the arm, a cutter support havinga shank slidably connected with thearm, and means for; clamping said shank and arm together.

13. In amachine for. grindingrotary cutters, a pivoted yieldingly-supported mem her, a longitudinally-groovedarm rotatably connected with, said memberthe axis of rotation being n line with the groove of the arm, a cutter support having a-shank en-- gaging the groove of the arm, a clamp for binding said shankin position, and means for rotatively. adjusting said arm and the cutter support clamped thereto.

1 1;. In machlne for grinding rotary cutters, a pivoted 'yieldingly supported longi tudi-nally-grooved arm, a cutter support having a shank engaging thegroove of the arm,

a clamp forv binding said shank in position,

anda screw carriedbysaid shank to coact with a portionot the arm to control rotati've position of the shank in .thegrooveot the arm} 15. The combination with a grinding ma,-

chine having a ledge,;oi:' a Worksupporting attachment normally projecting beyond the ledge, meansifor releasing the attachment from-v the ledge to provide 111016 space around the machine, and means for insuring accurate replacement. of the attachment after it has been removedfrom the machine.

16. A grinding machine having a reniovable work-supporting attachment, the frame of the machineand the. attachment having cooperating abutting members, one oi": which is adjustable, to determine the position of cutter support having a shank engaged with S21.1Cl.t1m, and 111651.118 tor clamping said the attachment relatively to the grinding element of the machine.

17 A work-supportingattachment for; a grinding machine, said attachment having aQbase'p'ortionprovidedwith a slot-to en--1 30 gage a cooperating fixed member of the machine, and a screw mounted in said base member and constructed and arranged to engage a fixed abutment of the machine.

18. A grinding machine having its frame provided with means for attaching a Worksupport thereto, said means including a clamp and an abutment, and a work-supporting attachment having a base portion provided with a slot to engage the sides of 10 said abutment and a screw constructed and arranged to cooperate with said abutment to determine the position of the attachment relatively to the grinding machine.

In testimony whereof I have signed my 15 name to this specification.

HENRY M. LOOMER. 

